Me and my friend, S, are relaxing on a hot summer day, during lunch. My other  3 friends are also talking on the bench, and doing their own thing. We get on the topic of people we don't like, and he starts with my sister and calls her annoying and weird. So, I retaliate, and say that he is jealous of me and my sister for having a healthy relationship, and getting along. For context, one time when we went to the mall together, he said “ My brother is annoying, and gross for not showering” Also, I try not to pick fights with him and smile and nod. I have also heard him trash talking his brother not only with me, but with our other classmates.) So, when I say this, he explains to me that he is an introvert and has a mental disorder that causes him to be less talkative and less friendly. So, I tell him that I am friends with a lot of people like that, and still have a good relationship with them. He reciprocates and says that his brother is different, and I try to be a good friend, and care about his family, and ask how. He immediately blows up, and pulls my hood over my head and says I am making fun of, and bullying his brother. 

I brush it off as one of his tantrums, and go to my other friend, J, who is usually found and told about arguments with me by S. So, I tell him the whole story and he believes it. Other classmates walk up and ask me what happened, so I tell them. Once we arrive in the classroom, S confronts me for gossiping, so I tell him that it is not gossiping if it was true, and ignore him to let him cool off. He tries to fight with me more in class, and more classmates ask him about the situation. He tells them I was “ bullying and making fun of his brother for having a disorder” The classmates that heard that started accusing me of this, and eventually, I get sent to the principal’s office, to talk it out with S. 

When we arrive at the principal’s office, me and S explain both sides of the situation. But, he was accusing me of false information. Apparently I said “That's not my problem” when he told me his brother had a disorder. He also tried to make excuses that he only trash talked his brother once, and that he had always had a good relationship with him, but it was just one time (lies). I told the exact truth, and everything I'm telling you now. Fast forward, the principal was telling us how we can talk negatively about our siblings at school, and my mom arrived at the office to pick me up for my braces appointment. There was still more I needed to talk about with the principal and S, but he said it would have to wait. Later that day, my sister told me what happened when S got back to class; S told the whole class that I was bullying his brother, and everyone now hates me. Am I the Ass Hole?

Extra Context:

I couldn't defend myself, due to my braces appointment, unlike S who could walk out, and tell the whole class.

My other three friends that were next to us were talking, and couldn't hear it, but once S told his “story” they believed it.

S usually gaslights me in arguments, but never this bad. S usually walks away when he knows I'm right, but this time, he turned the situation against me.